218606400464 has 10 divisors (see below), whose sum is σ = 423549900930. Its totient is φ = 109303200224.

The previous prime is 218606400451. The next prime is 218606400541. The reversal of 218606400464 is 464004606812.

It can be written as a sum of positive squares in only one way, i.e., 189740390464 + 28866010000 = 435592^2 + 169900^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6831449999 + ... + 6831450030.

It is an arithmetic number, because the mean of its divisors is an integer number (42354990093).

Almost surely, 2^218606400464 is an apocalyptic number.

It is an amenable number.

218606400464 is a deficient number, since it is larger than the sum of its proper divisors (204943500466).

218606400464 is a wasteful number, since it uses less digits than its factorization.

218606400464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13662900037 (or 13662900031 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The spelling of 218606400464 in words is "two hundred eighteen billion, six hundred six million, four hundred thousand, four hundred sixty-four".